Making a double post to make sure the message reaches you: you can find peat moss sold in Finland under the name "turve". The Finnish name may sound (to Finns) like it's something else, but it is actually just peat moss.

Note that there are different options, some with fertilizers/potassium, others with nothing added. You can find most of them at many hypermarkets and hardware stores, and probably all gardening stores have at least small packages. If you only need a bit for potted plants, there are 50l sacks, if you need more you may want to look at the 320l sacks. I am not sure if all options are available in all sizes, so it's best to go take a look.

In Finlans around 1/3 of the land area is categorized as swamp. There are different types of swamp of which some are more closer to forest in my opinion but still there is 5,1 million hectars of "geological swamp" according to Wikipedia. So finding peat moss shouldn't be mission impossible in Finland